Samsung ML-1430 Service Manual

SERVICE
LASER PRINTER ML-1430
Manual
LASER PRINTER CONTENTS
1. Precautions
2. Specifications
4. Troubleshooting
5. Exploded Views and Parts List
6. Block Diagram
7. Connection Diagram
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- This Service Manual is a property of Samsung Electronics Co.,Ltd. Any unauthorized use of Manual can be punished under applicable
International and/or domestic law. -
the ITSELF system Samsung Electronics Co., Ltd.
http://itself.sec.samsung.co.kr
©Samsung Electronics Co.,Ltd. December. 2002
Printed in Korea.
VERSION NO. : 1.01 CODE : JC-0072A
This manual is stated and
provided for service description.
All rights reserved. Any parts of the information in this manual are prohibited from free duplication, use or translation without prior written approval except in cases allowed by the Copyright Act. Specifications are subject to change without prior notice.
Copyright (c) 2002. 12.
Samsung Electronics Digital Printing CS Group
1-1
Samsung Electronics
1. Precautions
Please read the following carefully to prevent any accidents and not to damage the unit during service.
1.1 Safety Precautions
1.2 Precautions on Disassembly and Reassembly
1. Safety Precautions There are some electric or machinery parts with safety related property. If the parts replaced are dif­ferent from the original, the safety may not function. Even if the part could allow higher voltage than that of the part used, do not replace it and use a regular product clarified in specifications.
2. Be careful not to leave a switch, a cover or a safety
device out when reinstalling or assembling the prod­uct after repair.
3. Replacing Precautions Do not change or add parts as you like. You cannot benefit from such a remodeled product at your will during the term of guarantee.
4. You must replace overheated or damaged parts or
cords with regular products. Please solve the prob­lem causing any damage or overheating and troubles beforehand.
Especially mind the safety on the part with this mark.
You must use regular parts described in specifi­cations for the parts inflammable and where the current can be flown. Otherwise any hazard such as an electric shock or a fire could occur.
LASER STATEMENT (LASERTURVALLISUUS)
WARNING : NEVER OPERATE AND SERVICE THE PRINTER
WITH THE PROTECTIVE COVER REMOVED FROM LASER/SCANNER ASSEMBLY. THE REFLECTIVE BEAM, ALTHOUGH INVISIBLE, CAN DAMAGE YOUR EYES.
Class 1 laser product
Luokan 1 laserlaite Klass 1 laser apparat
Allonpituus 770-795nm Teho 0.3mW±0.03mW
CAUTION
VORSICHT
ATTENTION
ATTENZIONE
PRECAUCION
CAUTION : Avoid exposure to invisible laser radiation when the
development unit is not installed.
INVISIBLE LASER RADIATION WHEN THIS COVER OPEN. DO NOT OPEN THIS COVER.
UNSICHTBARE LASERSTRAHLUNG, WENN ABDECKUNG GEOFFNET. NIGHT DEM STRAHLAUSSETZEN.
REYONNEMENT LASER INVISIBLE EN CAS D’OUVERTURE. EXPOSITION DANGERUSE AU FAISCEAU.
RADIAZIONE LASER INVISIBLE IN CASO DI APERTURA. EVITARE L’ESPOSIZONE LA FASCIO.
REDIACION LASER INVISIBLE CUANDO SE ABRE. EVITAR EXPONERSE AL RAYO.
Very careful precautions should be taken when replacing parts. Before replacing, please check cables because you cannot put the cables that you removed for replacing parts into the proper place if you would not make sure of where they were connected and in which condition.
Please do the following before disassembling for a repair or replacement of parts.
1. Pull out paper cassette, printer cartridge installed.
Especially careful not to be scratched by the surface of developer or not to expose them to light.
2. Turn the power switch off.
3. Take out the power plug, printer cable from the printer.
4. Use only the same type of part as original when replac-
ing parts.
5. Do not force to open or fasten plastic material compo-
nents.
6. Be careful that small parts such as screws should not
get in the printer.
7. When disassembling, assembling, also observe small components are located in place.
8. If you uncover and turn the machine over to replace some parts, toner or paper particles may contaminate the LSU window. Protect the LSU window with clean paper.
Releasing Plastic Latches
Many of parts are held in place with plastic latches. The latches break easily : release them carefully. To remove such parts, press the hook end of the latch away from the part to which it is latched.
Precautions
1-2
Samsung Electronics
1.3 Tools for Troubleshooting
The following tools are recommended for safe and smooth troubleshooting described in this service manual.
DCU(Diagnostic Control Unit)
Standard: Test equipment to diagnose the Laser printer supplied by Samsung Electronics.
DVM(Digital Volt Meter)
Standard: Indicates more than 3 digits.
Electronic Scale
Standard: Equipment to check the weight of consumables(toner cartridge) supplied by Samsung Electronics. (The gram unit can be measured.)
Driver
Standard: "-" type, "+" type (M3 long, M3 short, M2 long, M2 short).
Pinset
Standard: For general home use, small type.
Cotton Swab
Standard: For general home use, for med-
ical service.
Cleaning Equipments a IPA(Isopropyl Alcohol)dry cloth or a soft stuff neutral detergent.
Software(Driver) installation CD ROM
Mind your hands not to be touched when you disassemble and reassemble PBAASS'Y , such as the main board, SMPS, HVPS.
Note
1
2
3
4
5
6
7
8
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Samsung Electronics
2. Specifications
Speed Resolution FROP(Fist Power On Time) Warm-Up T ime Power Consumption Dimension Weight Processor Memory Emulation Interface OS Support
N/W Input Output Manual Media Type
Type Life Cartridge Pick up Roller Feed Roller Transfer Roller Fuser Key & LED LCD Toner Save Reprint
Engine
Controller
Paper
T oner
User interface
ML-1430
14 ppm
600 x 600 dpi
Under 12.0 sec
30 sec
250 W (Print), 10W (Sleep)
329 x 355 x 231 mm (13” x 14” x 9.1”)
Max 6.5Kg (With Toner Cartridge)
Jupiter3 66MHz
8MB Equivalent
SPL (Samsung Printer Language)
IEEE1284, USB
Windows 95/98/2000/Me/NT,
Linux(Radhat 6.0), iMac(Mac OS 8.0)
External 150 sheets 100 sheets
1 sheet
A4, Letter. Legal, Executive, B5, A5, Folio,
7 3/4(Monarch), #10, DL, C5, C6, B5
Single Cartridge
2,500 sheets
2,500 pages(Initial : 1,000 pages)
60,000 pages 60,000 pages 60,000 pages 40,000 pages
3Key, 4LEDs
No YES YES
3.1.1 Front Cover
1. Pull the both side of the cover to open.
2. Remove a screw and remove the stopper that holds the printer cover.
3. Loosen the right lower part of the cover, then push the cover in the direction of arrow to loosen the left lower part.
4. Remove a screw of the front cover PCB and remove the connector, then remove the cover.
3.1.2 Other Covers
1. Before you remove other covers, you should remove the F
ront cover in advance.
2. Rear Cover : Remove the cover in the direction of .
3. Top Cover : Remove the cover in the direction of .
4. Side Cover L, R : Remove the cover in the direction of .
3-1
Samsung Electronics
3. Disassembly and Reassembly
3.1 Cover Assembly
a
b
c
Disassembly and Reassembly
3-2
Samsung Electronics
3.2 LED Panel PBA
1. Before you remove other covers, you should remove.
• Front Cover (see [3.1 Main Cover])
2. Remove two screws of PCB cover, and widen the hooks( ) to remove.
3. Remove two screws, and remove LED panel.
4. Remove PCB from the PCB cover.
3.3 LSU(Laser Scanning Unit)
1. Before you remove LSU, you should remove front cover, rear cover and top cover.
• Main Cover (see [3.1 Main Cover])
2. Remove three screws securing the LSU.
3. Remove two connectors from the LSU, then remove the LSU.
a
b
c
Disassembly and Reassembly
3-3
Samsung Electronics
3.4 Transfer Roller
1. Open the front cover.
2. Use a proper tool("-" type screwdriver) to pull the one end of the roller slightly, then take it out.
3.5 FAN & Motor Assembly
1. Before you remove the motor assembly, you should remove:
• Main Cover (see [3.1 Main Cover])
• Shield Engine Assembly
2. Remove one screws securing the Fan.
3. Remove five screws securing the Motor Assembly and remove a connector from Engine Board(Engine board and SMPS Board are integrated), then take the Motor Assembly out.
XO
Shield Ground
Note
When you reassemble the FAN, make sure that the direction of the Fan is cor­rect(the shield ground is downcast)
Disassembly and Reassembly
3-4
Samsung Electronics
3.6 HVPS Board
1. Before you remove HVPS board, you should remove:
Main Cover (see [3.1 Main Cover])
2. Remove four screws and a connector from HVPS board, then take the board out.
3.7 Fuser Assembly
1. Before remove fuser assembly, you should remove:
Main Cover (see [3.1 Main Cover])
2. Remove two ground screws and a connector as illus­trated.
3. Remove two screws and unplug a fuser assembly harness. Then use a " - " screwdriver to unlatch the fuser assembly to remove.
Note
When you reassemble the HVPS board, make sure that five terminals should be put in place.
Terminal
Disassembly and Reassembly
3-5
Samsung Electronics
3.8 Thermostat and Halogen Lamp
1. Remove a screw from the fuser assembly and remove the thermostat cover, then remove two screws securing the thermostat.
2. Remove two screws from the fuser assembly, and take the Heat Roller out.
3. Take the halogen lamp out from the Heat Roller.
Note
When you reassemble the halogen lamp, handle it with care as it is fragile.
Disassembly and Reassembly
3-6
Samsung Electronics
3.9 SMPS Board
1. Before you remove the SMPS board, you should remove:
Main Cover (see [3.1 Main Cover])
2. Remove screws in the order of then remove the shield engine assembly.
3. Unplug connectors from the main board and connec­tors from SMPS, then remove the SMPS. Remove four screws from SMPS and remove the SMPS board.
Note
The Engine board and SMPS board are integrated in a body.
a
b
a
b
Disassembly and Reassembly
3-7
Samsung Electronics
3.10 Main Board and Sensor Board
1. Before you remove the main board, you should remove:
Main Cover (see [3.1 Main Cover])
SMPS board (see [3.9 SMPS Board])
2. Remove two screws from the main board and unplug all of connectors, then remove the board.
3. Release four snap-fits securing the insulator engine board and then remove the insulator.
4. Release four snap-fits securing the sensor board and then remove the sensor board.
Main B’d
4-1
Samsung Electronics
4. Troubleshooting
4.1 How to use DCU
4.1.1 DCU Setup.......................................Page(4-2)
4.1.2 Code.................................................Page(4-2)
4.1.3 Self Diagnostic Mode......................Page(4-3)
4.1.4 Self Test Button.................................Page(4-4)
4.1.5 Paper Path Layout............................Page(4-4)
4.2 The cause and solution of Bad image
4.2.1 Vertical Black Line and Band...........Page(4-5)
4.2.2 Vertical White Line............................Page(4-5)
4.2.3 Horizontal Black Band......................Page(4-6)
4.2.4 Black/White Spot..............................Page(4-6)
4.2.5 Light Image.......................................Page(4-7)
4.2.6 Dark Image or a Black .....................Page(4-7)
4.2.7 Uneven Density................................Page(4-8)
4.2.8 Background.......................................Page(4-8)
4.2.9 Ghost (1)...........................................Page(4-9)
4.2.10 Ghost (2)..........................................Page(4-9)
4.2.11 Ghost (3)...........................................Page(4-10)
4.2.12 Ghost (4) .........................................Page(4-10)
4.2.13 Satins on the Face of Page............Page(4-10)
4.2.14 Satins on Back of Page ..................Page(4-11)
4.2.15 Blank Page Print out (1)..................Page(4-11)
4.2.16 Blank Page Print out (2)..................Page(4-11)
4.3 The cause and solution of the bad discharge
4.3.1 Wrong Print Position........................Page(4-12)
4.3.2 JAM 0...............................................Page(4-12)
4.3.3 JAM 1...............................................Page(4-13)
4.3.4 JAM 2...............................................Page(4-13)
4.3.5 Multi-Feeding...................................Page(4-14)
4.3.6 Paper rolled in the fuser..................Page(4-14)
4.3.7 OPC..................................................Page(4-15)
4.4 The cause and solution of the malfunction
4.4.1 All LEDs blinking (Fuser Error)........Page(4-16)
4.4.2 All LEDs blinking (SCAN ERROR)..Page(4-16)
4.4.3 Not function of the gear of the fuser due to melt-
ing away............................................Page(4-17)
4.4.4 Paper Empty.....................................Page(4-17)
4.4.5 Paper Empty without indication.......Page(4-17)
4.4.6 Cover Open ......................................Page(4-18)
4.4.7 No lamp on when the cover is open
...........................................................Page(4-18)
4.4.8 Defective motor operation................Page(4-19)
4.4.9 No Power..........................................Page(4-19)
4.4.10 Vertical Line Getting Curved..........Page(4-20)
4.5 Toner Cartridge Service
4.5.1 Precautions on Safe-keeping of Toner Cartridge
..........................................................Page(4-21)
4.5.2 Service for the Life of Toner Cartridge
..........................................................Page(4-21)
4.5.3 Service for Judgement of Inferior Expendables
and the Standard of Guarantee......Page(4-21)
4.5.4 Signs and Measures at Poor toner cartridge
..........................................................Page(4-22)
4.6 The cause and solutions of bad environment of the software
4.6.1 The printer is not working (1)...........Page(4-25)
4.6.2 The printer is not working (2) ..........Page(4-26)
4.6.3 Abnormal Printing.............................Page(4-27)
4.6.4 SPOOL Error ...................................Page(4-28)
Troubleshooting
4-2
Samsung Electronics
4.1 How to use DCU
4.1.1 DCU Setup
You can examine the malfunction of the printer. To perform DCU, open the front discharge cover and leave the connect the harness wire(10 pin/4 pin) to the CN10(4 pin) of the Main control board.
4.1.2 Code
Connect DCU to the printer and turn the power on. It show 7 LED on the panel and each code tells the function of the printer.
Normal Code
While printing or warming up, it indicate the position of the paper
61 Warm up The printer is on, the cover is open or close. 00-05 Ready(kind of paper) The printer is ready, the paper is detected when the first paper is printed.
00: Legal , 01: Letter , 02: A4 , 03: EXEC , 04: B5 , 05: Folio 20 Print Start The engine controller received the print order from the video controller. 30 Feed Sensor On The paper is passing out of the Feed Sensor. 40 Feed Sensor off The paper has passed out of the Feed Sensor. 50 Paper Out The paper has passed out of Exit Sensor. 69 Sleep Mode The fuser power turned off to minimize the power consumption.
Error Code
When detecting the malfunction, the printing is stopped to indicate error code.
60, 62, 68
Fuser Error The error in the fuser occurred. There is a short circuit in the thermistor and the
thermostat while printing, Low Temperature Error occurs.
• 60: Open Fuser Error
• 62: Low Heat Error
• 68: Over Heat Error 64 Cover Open The Printer Cover is open or Toner Cartridge not installed. 70 No Paper No paper in the paper cassette. 71 Paper Jam 0 The front part of paper is jammed between pickup unit and Feed sensor. 72 Paper Jam 1 The front part of paper is jammed between the Discharge sensor and Feed sensor. 73 Paper Jam 2 The front part of paper is jammed just after passing through the discharge sensor. 95 LSU Not Ready LSU Scanner Motor not ready or Hsync signal not output.
Troubleshooting
4-3
Samsung Electronics
4.1.3 Self Diagnostic Mode
If Error code occurs due to malfunction of the printer, perform Self Diagnostic Mode to solve the problem. The printer works only in the self-test mode to solve the malfunction problem.
To enter the self-test mode, turn the power on pressing the buttons of [Down], [Shift] and [Stop] at the same time. Release the button within 2 or 3 seconds if 78 shows in the DCU. If 00 shows in the DCU, press the button [Up] or [Shift] to select the self+test , and press the button of [Enter] to operate. To stop, press the button of [shift] and [Enter] together.
00 Main Motor Operating System
Only the main motor is in operation.
01 Main High Voltage On(THV-)
-1550 voltage output by MHV terminal. Caution : High voltage probe should be
used.
02 Transfer High Voltage(-)On(THV-)
-1300 voltage output by MHV terminal. Caution
:
High voltage probe should be
used.
03 Transfer High Voltage (+)Reference on (THV +)
1300 voltage output by MHV terminal. Caution : High voltage probe should be used.
04 DEV/supply High Voltage : DEV/Supply High Voltage Test.
The left one of the three LEDs in the
self-test panel is on when DEV high voltage Supply high voltage output
by each HV terminal. Press the [Up] button to switch the voltage. The middle and right one of the three
LEDs
are on and -530 voltage output by DEV HV terminal.
Caution : High voltage probe should be used.
05 LSU Operating System
The scanning motor of LSU is in operation, the right LED of the three buttons on. Press the [Up] button to Check LD. LD is functioning and the middle button is on. If the LD is normal, all LEDs are on.
06 Pickup clutch on
The Solenoid in the printer is in operation. To stop the operation, Press the button [shift] and [Enter] together.
07 Pempty/PWIDTH/New CRU Sensor Test : Pempty/PWIDTH.HEW CRU sensor test.
If activate the Actuator of the PEMPTY/PWIDTH Sensor, the left and right of the three LEDs are on. If you install new toner Cartridge in this mode, the right LED is on.
08 Feed & Exit Sensor Test
Test the Feed sensor and Discharge sensor in the same way as '06'.
09 Cover Open Sensor Test
The same way as code '06'.
10 Fuser Test
If the [Enter] button pressed, the right LED is on and temperature of the fuser is up to READY Mode. If the [Up] button pressed, the middle LED is on and temperature of the fuser is up to Printing Mode. If you press the button once more, the left LED is on and temperature of the fuser is up to overheat Mode.
11 Hot Burn Test
If the [enter] button pressed, the printer is continuously printing without detection. Turn the power off to stop operation.
12. Cleaning Mode Print Mode
Print the paper to clean the OPC Drum in the Cartridge.
Troubleshooting
4-4
Samsung Electronics
13. THV(+) TRIGGER. ALL HV
All high voltage output by each HV terminal and LSU and the fan is in operation. In this mode, electronic resistance of transfer roller and high voltage is detected. If no toner cartridge in the printer, output of THV is +199V ~ + 2100V.
14. PTL Test
Indicates the PTL LED.
15. Fan Test
Indicates the function of the fan.
4.1.4 Self Test Button
If the Self-Test button pressed, vertical lines are printed. Turn the power on while pressing this button, '89' shows in the DCU and the printer is warming up. After warming-up the
printer is in READY Mode, and '88' shows in the DCU. In this mode, without any detection, the printer begins printing(trial printing and data from the PC). It is convenient to use this mode when the engine malfunction is detected in the control board.
4.1.5 Paper Path Layout
EXIT 2
FUSER
FACE UP
EXIT 1
FEED SEN
EMPTY SEN
KNOCK UPKNOCK UP
LSU
CARTRIDGE
LSU
CARTRIDGE
PICK UP
FEED
IDLE
PTL
DR
SR
RECORDED PAPER (100 SHEETS)
RECORDED PAPER (150 SHEETS)
MANUAL 1 SHEET
EXIT SENSOR
OPC
CR
TR
FACE DOWN
SENSOR BOARDSENSOR BOARD
MAIN BOARDMAIN BOARD
SMPS
SHIELDSHIELD SHIELDSHIELD
H R/L
Pr R/L
Troubleshooting
4-5
Samsung Electronics
4.2 The cause and solution of Bad image
4.2.1 Vertical Black Line and Band
• Description
1. Straight thin black vertical line occurs in the printing.
2. Dark black vertical band occur in the printing.
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
Check and Cause Solution
1. Damaged develop roller in the Developer or deformed Doctor-blade.
2. Scratched surface of the discharge roller in the developer, or heavily accumulated foreign matters between the discharge roller and fur transfer roller/ charge roller.
3. Partly depression or deformation on the surface of the transfer roller.
1. If causes 1 and 2 occur in the developer cartridge, replace the developer and try to print out.
2. Replace the transfer roller if occurred as No. 3.
4.2.2 Vertical White Line
• Description White vertical voids in the image.
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
Check and Cause Solution
1. Foreign matter stuck onto the window of internal lenses of LSU mirror.
2. Foreign matter or toner particles between the developer roller and blade. (In case the life of the developer has been expired, white lines occur in front of the image.)
3. It may occur when Burr and foreign sub­stances are on the window of the devel­oper frame.
4. If the fuser is defective, voids occur peri­odically at the top of a black image.
1. Foreign matter stuck onto the window : Clean the LSU window with recommend­ed cleaner(IPA) Clean the window with a clean cotton swab.
2. Foreign matter in the LSU : Open the cover of LSU and clean with a cotton swab on the surface of the reflex mirror.
3. No 3. : Remove the foreign matter and burr of the exposure window.
4. No. 4. : Open the front cover and check ribs that corresponds to the position of the voids. Remove if found.
5. If the problems are not solved, check to see if the weight of the developer is below 670g. If so, replace the developer cartridge.
Troubleshooting
4-6
Samsung Electronics
4.2.3 Horizontal Black Band
• Description
1. Dark or blurry horizontal stripes occur in the printing periodically. (They may not occur periodically.)
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
Check and Cause Solution
1. Bad contacts of the voltage terminals to developer.
2. The rollers of developer may be stained. Charge roller = 37 mm Supply roller = 27 mm Develop roller = 32 mm Transfer roller = 47 mm
1. Clean each voltage terminal of the Charge, Supply, Develop and Transfer roller.
(remove the toner particles and paper par­ticles)
2. Clean the right Gear that has relatively
small gap of the teeth in the OPC.
3. If the malfunction persists, replace the
developer.
4.2.4 Black/White Spot
• Description
1. Dark or blurry black spots occur periodically in the printing.
2. White spots occur periodically in the printing.
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
Check and Cause Solution
1. If dark or blurry black spots occur periodi­cally, the rollers in the Developer may be contaminated with foreign matte or paper particles. ( Charge roller : 37 mm interval
OPC drum : 75mm interval)
2. If faded areas or voids occur in a black image at intervals of 75 mm, or black spots occur elsewhere, the OPC drum surface is damaged.
3. If a black image is partially broken, the transfer voltage is abnormal or the trans­fer roller's life has expired.
1. Run OPC cleaning Mode Print and run the Self-test 2 or 3 times.
2. In case of 75mm interval unremovable in 1, cleanly remove foreign substances stuck on the OPC location equivalent to black spots and white spots with a dry duster.
3. The transfer roller guarantees 50,000 sheets printing. If the roller's life is expired, replace it.
4. In case of 37mm interval unremovable in 1, take measures as to replace the developer cartridge and try to print out.
5. Clean the inside of the set against the paper particles and foreign matter in order not to cause the trouble.
Troubleshooting
4-7
Samsung Electronics
4.2.5 Light Image
• Description The printed image is light, with no ghost.
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
Check and Cause Solution
1. Develop roller is stained when the toner of developer cartridge is almost con­sumed.
2. Ambient temperature is below than 10°C.
3. Bad contact caused by the toner stains between the high voltage terminal in the HVPS and the one in the set.
4. Abnormal output from the HVPS. (Run self-test and check 1~4)
1. Check if the Toner Save mode is off.
2. R
eplace the developer cartridge and try to
print out.
3. Wait 30 minutes after printer is powered on before you start printing.
4. Clean up the contaminated area by the toner.
5. Replace the HVPS if the problems are not solved by the above four directions.
( Service parts : Figure 11, Chapter 5)
4.2.6 Dark Image or a Black
• Description The printed image is dark.
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
Check and Cause Solution
1. No charge voltage in the engine board. ( Perform DCU diagnostic code 01)
2. Charge voltage is not turned on due to the bad contacts between power supply in the side of the Developer and charge terminal of HVPS.
1. Clean the high voltage charge terminal.
2. Check the state of the connector which connects the engine board and HVPS.
3. Replace the HVPS if not solved by the above direction 1 and 2.
Troubleshooting
4-8
Samsung Electronics
4.2.7 Uneven Density
• Description Print density is uneven between left and right.
Check and Cause Solution
1. The pressure force on the left and right springs of the transfer roller is not even, the springs are damaged, the transfer roller is improperly installed, or the trans­fer roller bushing or holder is damaged.
2. The toner level is not even on the devel­oper roller due to the bad blade.
1. Replace both the left and right Spring Holder.
2. Occur in the developer cartridge, replace the developer and try to print out.
4.2.8 Background
• Description Light dark background appears in whole area of the printing.
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
Check and Cause Solution
1. Recycled recording paper has been used.
2. The life of the Developer has expired.
(The weight at the expiration of the
developer's life: 800 ± 20g)
3. The up-to-down movement of the trans­fer roller is swift?
4. The HVPS is normal? (Perform DCU diagnostic code 01~04)
1. B/S is not guaranteed when using recycled paper.
2. Replace the Developer that has expired.
3. Clean the busing part of the transfer roller.
4. Replace the Developer if not solved by the above direction 1~3.
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